Hi,

I just rebuilt a fairly old laptop - Compaq Armada E500 with win xp pro. when i downloaded the latest win updates after installing the machine keeps rebooting and getting a fatal error - c00000021. Am i right in saying its just one of the updates causing this??

Not likely. What's the exact error code and message?

i_XpUser

Havent got details with me at the moment.
in basic terms machine gets bsod - complaining of c0000021 fatal error.
This only occured after installing the updates and machine is fine running with straight SP2 with no updates. I have tried just installing a few updates -namely Microsoft .Net framework 1.1 and 1 of the cume sec updates. machine is still working fine with those 2 .so i get the feeling it is one of the updates causing an issue

Well I still need the exact diagnostic code and message. Speculating is something I do not do.

i_XpUser

Hi ,

Just had a scout around and looks like its to do with the logon service/process. This message can occur because of updates not installing correctly or successfully. I was running Norton Anti 2005 and adware at the time ,could these cause a possible problem with successfull installation of windows updates??.

I realise you want the detail ,but just punch in c0000021 fatal error in google and youll see what i mean ,there is page on Microsoft .

STOP: c000021a {Fatal System Error}
The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000034 (0x00000000 0x0000000)
The system has been shutdown.

Regards

Delmo

Delmo-

I am having the exact same problem on my machine and it has happend a few times and i cannot figure it out... if you have any luck you should let me know what the problem was thanks!